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BRASILIA, BRAZIL - MARCH 19: Brazil's President Michel Temer (L) shakes hands with Vice-President of Equatorial Guinea Teodoro Obiang Mangue (R) during the opening ceremony of the 8th World Water Forum at Itamaraty Palace in Brasilia, Brazil on March 19, 2018. The World Water Forum is the worlds biggest water-related event and is organized by the World Water Council (WWC), an international organization that brings together all those interested in the theme of water. (Photo by Andre Coelho/Anadolu Agency/Getty Images)

BRASILIA, BRAZIL - MARCH 19: Brazil's President Michel Temer (L) shakes hands with Vice-President of Equatorial Guinea Teodoro Obiang Mangue (R) during the opening ceremony of the 8th World Water Forum at Itamaraty Palace in Brasilia, Brazil on March 19, 2018. The World Water Forum is the worlds biggest water-related event and is organized by the World Water Council (WWC), an international organization that brings together all those interested in the theme of water. (Photo by Andre Coelho/Anadolu Agency/Getty Images)